the word 'sweatshirt' is a modern english compound, formed by combining 'sweat' and 'shirt'. its origin is purely functional and descriptive, emerging in the early 20th century to denote a thick, absorbent cotton jersey shirt originally worn by athletes to absorb sweat during training or to keep warm before or after exercise. unlike many classical compounds, its logic is transparent and utilitarian, directly linking the garment's material purpose ('sweat') with its basic form ('shirt'). this straightforward compounding reflects a pattern common in english for naming practical, everyday items.

Structure: sweat + shirt sweat (from old english swāt, meaning perspiration; functions as a modifier). shirt (from old english scyrte, meaning a short garment; functions as the base noun).